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On 3 May 2005 at 9:24, Toby Erkson wrote: > In another VW forum I'm in a guy said he lost some whp (wheel > horsepower) when he installed larger brakes on his [race] car -- this > included a larger rim/tire as well I believe. I don't agree with this > but he said his dyno proved it. Now, I don't know if there was anything > else done to the car prior to the 'after' dyno. Anyway, is it true that > changing the rotational mass on the wheels will affect whp? I can > understand acceleration changes but, like a flywheel, its weight > shouldn't affect the hp/torque...right? If I'm wrong please edumicate > me :-) If I'm right, what could be some plausible reasons why his whp > dropped? I'm with you. In the absence of acceleration, I don't see how this would affect whp other than by forcing different rpms for a given speed. I suppose that he might have switched to some tires with big knobby treads, which can have large rolling resistance losses.... -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~